I tried all the comic reading apps I could find for OS X and this was by far the best. I use Comix quite a lot in Ubuntu and really like it. This is the closest thing.

As you asked for suggestions how about being able to bookmark pages? This would be great for those reading more than one comic at once ;) Also, it'd be great if you could open a folder with multiple comics in - then when you finish one the next one would automatically load as you flick to the next page.